1D graphene nanoribbons have tunable electronic bandgaps, thereby enabling graphene electronic/optoelectronic applications.We have demonstrated both bottom-up and top-down methods for fabricating graphene nanoribbons.First, we present surface-assisted bottom-up fabrication of atomically precise armchair graphene nanoribbons (AGNRs) with predefined widths, namely 7-, 14-and 21-AGNRs, on Ag (111) as well as their spatially resolved width-dependent electronic structures.